Molding flask



Feb. 27, 1934. G. A. wEcHERT MOLDING FLASK Filed May 23, 1931 UST-THE 'NvENToR ATTORNEY Patented Feb. 27, 1934 UNTED STATES PATENT QFFICE 9 Claims.

My invention relates to molding fiasks, of a type adapted for general use, but especially suitable for the duplication of models.

More particularly stated, my invention relates to a fiask adapted for use with molding materials in the nature of a gelatinous composition, which at normal room temperatures is tough and resilient, but which When heated to the boiling point of water becomes liquid like water, and at intermediate temperatures'becomes more or less viscous according to requirements.

Among the compositions available for this purpose are some which have heretofore been used in the construction of inking rollers for printing presses.

The molding composition, as employed in connection with my improved molding fiask, is not used as the material of either the pattern or the finished casting. Instead, it is used as impression material, something after the manner of molding sand; that is, to first receive an impression and then to serve as a mold in which a casting is formed on the duplicate model.

An object of the invention is to provide a molding fiask of the type indicated which shall be simple in construction, efiicient in its operation, and which will embody means by which it may be quickly and efiiciently cooled and thereby made easy and efficient to use.

Other objects and aims of the invention, more or less specific than those referred to above, will be in part obvious and in part pointed out in the course of the following description of the elements, combinations, arrangements of parts and applications of principles constituting the invention, and the scope of protection contemplated will be indicated in the appended claims.

Reference is made to the accompanying drawing forming a part of this specification, and in which like reference characters indicate like parts throughout all of the figures.

Figure 1 is a plan view of my improved molding fiask, in condition for work.

Figure 2 is a section on the line 2-2 of Figure 1, looking in the direction indicated by the arrows, and showing the flask as containing a pattern to be reproduced but otherwise empty.

Figure 3 is a plan view showing the closure plate of the fiask, and a model resting thereon.

Figure is an elevation of the molding ask, after the molding material is poured into it; certain parts being shown as broken away.

Figure 5 is a plan view of the fiask and its contents, shown as inverted and without the closure plate.

Figure 6 is a cross section through the ilask and the molding material therein, and shows the impression left by removal of the pattern.

Figure 7 is a cross section through the flask and contents after the impression is filled with 60. casting material, such as plaster of Paris.

Figure 8 is a perspective of the casting as finished.

The body member of the molding flask appears at 9, and is made of metal.

It has the general form of a cup with a sloping wall; that is, somewhat conoidal in form.

The body member is provided with a top head 10, integral with it, and provided with a pair of filling holes 11, 11 and a number of smaller sprue holes 12, 12, used as air outlets. A

The body member 9 is provided at its edge with a groove 13 of substantially V-form in cross section.

This groove is adapted to hold a filling 14, made 75, of any suitable plastic material and adapted to serve as a packing to seal the edges.

The head 10 is provided with a portion 15 formed into a small bowl, as shown, and capable of holding water, as indicated at 16, this water being used in cooling the ilask and its contents, as hereinafter more fully described.

The body member 9 is further provided with channels 17, 17 which lead radially outward from the bowl 15 and have downwardly extending portions 18.

With the parts arranged as indicated in Figure 4, if cold water be showered or directed upon the flask, it fills the cooling well 15 and fiows radially outward and downward, as directed by the channels 17 and 18.

By this arrangement the cooling water is distributed to good advantage, a portion of it being broughtas closely as practicable to the center of the device, and thus into proximity to the portion hardest to cool.

A closure plate is shown at 19,' and is provided with lugs 20, 20, integral with it, these lugs being mounted adjacent its edges and spaced apart as shown.

These lugs 20 serve to position the body member 9 upon the closure plate 19. With these two parts thus in position, and the filling 14 in the groove 13 and serving as a packing, the fiask is unable to leak.

A pattern is shown at 21, and may be a denture or a model to be used in place thereof.

The pattern 21 is placed upon the closure plate 19, as shown in Figure 3. It may be caused to adhere by means of a little wax or any other adhesive material suitable for the purpose.

The pattern 21 being thus fixed in position, the filling 14 is placed in the groove 13 so as to serve as a packing as above described, and the body member 9 is placed upon the closure plate 19, as shown in Figure 2, and pressed firmly downward thereupon.

This leaves the fiask in the condition indicated in Figures 1 and 2.

Next the molding material 22 is melted and poured into the flask, through one or both of the filling holes 11. The molding material is poured in until it completely fills the flask, and thus completely covers the pattern 21.

The next step is to cool the flask and its contents.

For this purpose the flask is placed in a sink or in a plate or bowl, as most convenient, and cold water is showered upon it.

The water fills the cooling well 15, and is thus brought into or in close proximity to the central portion of the flask.

The water also fills and follows the channels 1'7, 17, 18, 18, and cools the entire flask quickly and uniformly.

As the molding material 22 is very smooth and resilient, and as its softness varies with its varying temperature, this material has a tendency to become distorted within the flask, and to so turn as to displace the pattern.

This tendency is offset and practically neutralized by virtue of the fact that the channels 17, 1'1 serve as indentations in the wall of the flask, and as such indentations they prevent displacement of the molding material.

Thus the channels 17, 17, 18, 18, serve the double purpose of distributing the `flow of water or other cooling liquid and of anchoring the molding material 22 immovably within the flask.

Next the flask is taken up, all water upon it is removed, and the fiask is inverted and rested upon any convenient surface available for the purpose. The closure plate 19 is then removed, the device now appearing as indicated in Figure 5, the pattern 21 being exposed.

Then the pattern is extracted by hand, leaving a cavity 23, which is the impression desired.

Next the impression 23 is filled with plastic molding composition of any suitable kind, such as plaster of Paris, or with an Vinvestiture as required, and the casting thus formed, as shown at 24.

Then the molding composition or cast 24, with the molding material 22, is removed from the fiask, and the molding material 22 is broken into pieces, vthe casting 24 being left in the operator's hand.

From the casting 24 one or Vmore other castings may be reproduced, in the manner well known in this art.

I do not limit myself to the precise mechanism here illustrated and described, the scope of my invention being commensurate with my claims.

Having thus described my invention, what I .claim as new and desire to secure by Letters Patent is as follows:

1. A molding flask comprising a hollow body member provided with filling holes and sprue holes, and further provided with portions formed to distribute the flow of water to cool the hollow body and its contents, said portions thus formed being positioned and arranged to prevent the contents of the hollow body member from becoming displaced.

2. A molding ilask comprising a hollow body member intended to receive within the hollow interior thereof the material to be molded and to have water poured over its outer surface to cool said member and said contents, said hollow body member having a filling hole and having portions formed to distribute the fiow of water as said water flows by gravity over its outer surface to cool the hollow body member and its contents said portions being shaped to provide ribs interiorly of the hollow body member positioned and arranged to prevent the contents of the hollow body member from becoming displaced.

3. A molding flask comprising a hollow body member intended to receive within the hollow interior thereof the material to be molded and to have water poured over its outer surface to cool said member and said contents, said hollow body member having a filling hole and having portions formed to distribute the flow of water as said water flows by gravity over its outer surface to cool the hollow body member and its contents said portions being shaped to provide grooves exteriorly of the hollow body member and ribs interiorly of the hollow body member positioned and arranged to prevent the contents of the hollow body from becoming displaced.

4. A molding flask comprising a hollow body member intended to receive within the hollow interior thereof the material to be molded and to have water poured over its outer surface to cool said member and said contents, said hollow body member having a filling hole and having portions formed to distribute the fiow of water as said water flows by gravity over its outer surface to cool the hollow body member and its contents said portions being shaped to provide grooves exteriorly of the hollow body member along which water may flow when poured onto said body.

5. A molding flask comprising a hollow body member intended to receive within the hollow interior thereof the material to be molded and to have water poured over its outer surface to cool said member and said contents, said hollow body member having a filling hole and having portions formed to distribute the fiow of water as said water flows by gravity over its outer surface to cool the hollow body member and its contents said portions being shaped to provide a cooling well exteriorly of the body and grooves also exteriorly of the body radiating from said well so that cooling liquid from said well may fiow along said grooves exteriorly of the body.

6. A molding fiask comprising a hollow body member intended to receive Within the hollow interior thereof the material to be molded and to have water poured over its outer surface to cool said member and said contents, said hollow body member having a filling hole and having portions formed to distribute the flow of water as said water fiows by gravity over its outer surcontents said portions being shaped to provide a cooling well exteriorly of the body, grooves also exteriorly of the body radiating from said well soX that cooling liquid from said well may fiow along said grooves exteriorly of the body, and ribs face to cool the hollow body member and its interiorly of the body positioned and arranged to prevent the contents of the body from becoming displaced.

7. A molding ilask comprising an inverted cup shaped body member, a removable closure for the open bottom of said body member adapted to support a pattern thereon so as to support said pattern within the hollow of said body member, said body member having a filling hole through its upper Wall through which molding material may be poured to fill the body member about said pattern, and said body member having a groove exteriorly thereof along Which cooling liquid may flow When poured onto the body member for thereby cooling said body member and' the material within the body member.

8. A molding flask comprising an inverted cup shaped body member, a removable closure for the open bottom of said body member adapted to support a pattern thereon so as to support said pattern Within the hollow of said body member, said body member having a filling hole through its upper Wall through which molding material may be poured to fill the body member about said pattern, and said body member having a cooling well formed exteriorly in said top wall within which cooling liquid may be contained when poured onto said body member, said body being shaped so that said cooling Well provides a projection interiorly of the body member to stand substantially centrally of the molding material Within said body member, to thereby cool the body member and the molding material therein.

9. A molding fiask comprising an inverted cup shaped body member, a removable closurefor the open bottom of said body member adapted to support a pattern thereon so as to support said pattern within the hollow of said body member, said body member having a filling hole through its upper Wall through which molding material may be poured to fill the body member about said pattern, and said body member having a cooling Well formed exteriorly in said top wall within Which cooling liquid may be contained When poured onto said body member, said body member being shaped so that said cooling Well provides a projection interiorly of the body member to stand substantially centrally of the molding material within said body member, said body being further shaped to provide grooves exteriorly thereof radiating from said cooling well and extending downwardly along the exterior side surfaces of the body member along which cooling liquid from the well may fiow, all whereby to cool the body member and the molding material therein.

GEORGE A. WIECHERT. 

